Deferred Consideration - Summary of valuation of deferred consideration (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Disclosure Of Valuation Of Deferred Consideration [Line Item]
Discount rate	12.25%	9.00%
Perpetual growth rate	1.54%	1.00%
Minimum [Member]
Disclosure Of Valuation Of Deferred Consideration [Line Item]
Forward-looking gold price	$ 1,665	$ 1,833
Maximum [Member]
Disclosure Of Valuation Of Deferred Consideration [Line Item]
Forward-looking gold price	3,027	2,705
Weighted Average [Member]
Disclosure Of Valuation Of Deferred Consideration [Line Item]
Forward-looking gold price	$ 2,037	$ 2,106